<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>行对齐方式</title>
  <style>
    .box {
      display: flex;
      flex-wrap:wrap;
      justify-content: space-between;

      /*调整 行对齐方式*/
      /*align-content: center;*/
      /*align-content: flex-start;*/
      /*align-content: flex-end;*/
      /*align-content: space-between;*/
      /*align-content: space-around;*/
      align-content: space-evenly;
      height: 400px;
      border: 1px solid #000;
    }
    .box div{
      width: 200px;
      height: 100px;
      background-color: pink;
    }
  </style>
</head>
<body>
<div class="box">
  <div>1</div>
  <div>2</div>
  <div>3</div>
  <div>4</div>
  <div>5</div>
  <div>6</div>
  <div>7</div>
  <div>8</div>
  <div>9</div>
  <div>10</div>
  <div>11</div>
  <div>12</div>
</div>
</body>
</html>
